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I feel like I am right on this question but I keep getting it wrong. I have tried inputting 2 and $2+0i$. Am I missing something?

Thank you. enter image description here

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    $\begingroup$ Hm... I honestly don't know what you did wrong, unless my understanding of principal $n$th roots is wrong (that is, $k=0$) $\endgroup$ – Simply Beautiful Art Jan 21 '17 at 2:11
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    $\begingroup$ That was my understanding as well. Thank you. I will contact my professor. Just wanted to make sure it wasn't me first :) $\endgroup$ – MathIsHard Jan 21 '17 at 2:13
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    $\begingroup$ Given the syntax of the question, could it be looking for an answer in the form 2 + i 0? $\endgroup$ – dxiv Jan 21 '17 at 2:17
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    $\begingroup$ Out of curiosity, have you tried the other roots (namely, $-1 \pm i \sqrt{3}$)? $\endgroup$ – emma Jan 21 '17 at 2:20
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    $\begingroup$ How did you get it marked wrong? I mean who/what was the grader? A human being? I'm guessing they wanted it in $2 (\cos 0 + i \sin 0) $ format. But... that doesn't make you wrong. Or maybe they think the principal is not k=0 but k=1 so answer is $2 (\cos 2\pi/3 + Ii \sin 2\pi 3)$ but if that is what they think, they are in the minority. $\endgroup$ – fleablood Jan 21 '17 at 3:48
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Thank you everyone for the ideas and help. The program wanted it like this... $2, -1+i\sqrt{3}, -1-i\sqrt{3}$. I feel like the instructions should be improved personally.

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